debian: Update changelog to 0.15.1-fw.4

If we get a ussd response for transaction, but there is no connection
for this transaction, we will now complain, delete the message and return.

debian/changelog

@@ -1,3 +1,16 @@
+openbsc (0.15.1-fw.4) UNRELEASED; urgency=medium
+
+  * ussd: Avoid crashing when no connection is present in the transaction
+
+ -- Ivan Klyuchnikov <kluchnikovi@gmail.com>  Tue, 16 May 2017 19:40:00 +0200
+
+openbsc (0.15.1-fw.3) UNRELEASED; urgency=medium
+
+  * Added openbsc-dev package.
+  * New release of openbsc for fairwaves build.
+
+ -- Ivan Klyuchnikov <kluchnikovi@gmail.com>  Wed, 15 Feb 2017 21:11:04 +0200
+
 openbsc (0.15.1-fw.2) UNRELEASED; urgency=medium
 
   * Fixed rebase issues.

debian/control

@@ -36,6 +36,17 @@ Description: GSM Network-in-a-Box, implements BSC, MSC, SMSC, HLR, VLR
  components bundled together. When using osmocom-nitb, there is no need for a
  Mobile Switching Center (MSC) which is needed when using osmocom-bsc.
 
+Package: openbsc-dev
+Architecture: all
+Depends: ${misc:Depends}
+Description: Header file needed by tools tightly integrated
+ Some other programs depend on gsm_data_shared.h and gsm_data_shared.c
+ from OpenBSC. This package installs these files to your file system so
+ that the other packages can build-depend on this package.
+ .
+ The directory structure is copied after the structure in the repository
+ and the header and .c file are installed into /usr/src/osmocom/openbsc/.
+
 Package: osmocom-meas-utils
 Architecture: any
 Depends: ${shlibs:Depends},

openbsc/src/libmsc/ussd.c

@@ -218,6 +218,13 @@ int on_ussd_response(struct gsm_network *net,
 	msgb_put(msg, reqhdr->component_length);
 
 	ssrep.transaction_id = (trans->transaction_id << 4) ^ 0x80;
+
+	if (!trans->conn) {
+		DEBUGP(DSS, "No connection for transaction with id: %d\n",
+			     trans->transaction_id);
+		msgb_free(msg);
+		return -1;
+	}
 	rc = gsm0480_send_component(trans->conn, msg, &ssrep);
 
 	if (reqhdr->message_type == GSM0480_MTYPE_RELEASE_COMPLETE) {